The TOP VT 12540 C is supplied with the Basicline preselect system as standard. One double-acting spool valve controls the lifting and folding of all the rotors. Thanks to integrated stepping valves, the front rotors always lift and lower first. Using the toggle switches on the BASIC CONTROL terminal, you can choose between lifting and lowering the two front rotors together or separately. To adjust the working width, the two front rotors are operated together using a separate spool valve.